If you have no money at startup. My tip: GIMP. I used it and it has great features all you need for post production of your photos.

ViennaCC

If you want the best photo editing software in terms of features and support, Adobe Photoshop leads the pack. However, at around $70 per month for a full subscription and a steep learning curve, it is out of reach for some marketers.
Luckily, if you’re after an affordable and user-friendly photo editing tool, there are plenty of others available. Here are some of the best, budget-friendly alternatives.